1. Understanding the VIX
VIX measures implied volatility from S&P 500 options. When traders bid up put options (hedging downside), VIX rises. It usually moves opposite to share prices: VIX up, shares down.
VIX 10-15
Regime: Complacency
What it signals: Investors expect calm and pay little for protection
Risk: Sudden spike can hit 30+ in days
VIX 20-30
Regime: Elevated stress
What it signals: Investors are paying more for protection
Risk: Can mean-revert or spike further
VIX 40+
Regime: Panic
What it signals: Fear dominates. Historically, readings this high have often come near market lows
Risk: Can stay elevated (2008: VIX 80)
2. Historical VIX Spikes
- Autumn 2008 (Lehman): VIX closed above 80 in November. Shares kept falling for months afterwards: the S&P 500 did not bottom until March 2009, 57% below its peak.
- March 2020 (COVID): VIX closed at 82.7, its highest close on record. The S&P 500 fell 34% in about a month, then rose almost 70% from its low by the end of the year.
- Feb 2018 ("Volmageddon"): VIX jumped from about 17 to 37 in one day on 5 February, after months near record lows. Products that had bet on volatility staying low collapsed. The S&P 500 fell 10% and regained its high that August.
- Late 2018 (Fed rate rises): VIX rose from about 12 in early October to 36 on Christmas Eve as the S&P 500 fell almost 20%. After the Fed signalled a pause, it fell back to about 12 by April 2019.
What the Spikes Have in Common
Volatility spikes have not lasted: the VIX has always drifted back towards its average. But a spike is not a reliable sign that the worst is over. In 2020 the peak came within a week of the market low; in 2008 shares fell for another four months after it.
3. Market Liquidity Regimes
Liquidity = ease of buying/selling without moving price. High liquidity = tight bid-ask spreads. Low liquidity = flash crashes, gapping moves.
High Liquidity (Risk-On)
• Tight bid-ask spreads (stocks trade within pennies)
• Low VIX (10-15)
• High trading volumes
• Fed providing liquidity (QE, low rates)
Example:2017 ("vol of vol" collapse), 2021 (stimulus-driven rally)
Low Liquidity (Risk-Off)
• Wide bid-ask spreads (can't get filled at mid)
• High VIX (30+)
• Volumes often surge, but each trade moves the price more
• Fed tightening or crisis unfolding
Example: March 2020 (even Treasuries gapped), Oct 2008 (credit freeze)
4. VIX Term Structure
VIX futures trade at different maturities. Term structure shape reveals market psychology.
Contango (Normal)
Front-month VIX futures < later months. The usual state: volatility is expected to drift up from calm levels, and buyers of longer-dated protection pay a premium. What it signals: calm markets.
Backwardation (Panic)
Front-month VIX > back-month VIX. Markets expect volatility to fall (spike is temporary).What it signals: Forced and panic selling. In past episodes, backwardation has often marked the most intense phase of a sell-off.
5. Liquidity Indicators
- Bid-Ask Spread: Widening spreads = liquidity drying up
- Treasury Market Depth: how much can be traded near the current price; it fell sharply in March 2020
- Repo Market Rates: Spikes above Fed Funds = funding stress (Sep 2019 example)
- High-Yield Credit Spreads: Widening = liquidity leaving risk assets
- Fed Balance Sheet: QE = adding liquidity, QT = draining liquidity
Liquidity Illusion
Markets appear liquid until everyone tries to exit at once. March 2020: even Treasury market seized up. Liquidity tends to disappear exactly when the most people need it, which is why professionals pay attention to it in calm times too.
What History Shows
- VIX below 12: Calm, sometimes complacent markets. Long quiet spells have been followed by sudden spikes (February 2018 is a well-known example).
- VIX above 40: Reached in 2008, 2011 and 2020, among others. In 2011 and 2020 the spike came close to the market low; in 2008 the VIX peaked in October and November, but shares kept falling until March 2009.
- VIX backwardation: Has tended to mark the peak of a volatility spike rather than its start.
- High liquidity: Prices move smoothly and large trades barely shift the market.
- Low liquidity: Prices gap, and the hardest-to-trade assets (small caps, high yield bonds) usually fall furthest.
- QT (Fed draining liquidity): Less cash in the system has historically meant more fragile markets and larger moves on bad news.
Bottom Line
The pattern: Volatility tends to revert to its average: extreme fear and extreme calm rarely last. Liquidity sets how violently prices move when news arrives, which is why professionals watch the VIX, bid-ask spreads and the Fed's balance sheet together rather than any one of them alone.
Related
Educational content only. It describes how markets have behaved in the past and is not investment advice.